Siemens HiPath 8000 Spécifications télécharger pdf (Page 138)

Call Admission Control Features

A31003-H8022-F100-2-7618, October 2006

10-2 HiPath 8000 V2.2, Feature Description Guide

call_admission_control_features.fm

CAC Groups and Policies

10.2 CAC Groups and Policies

CAC group

represents the group of endpoints being served by the bandwidth-limited link

which needs to be monitored. CAC groups are defined based on one of the following

parameters:

● Subnet

● Directory number: this can be a DN prefix (such as 1561555*) or the DN of a single user

(such as 15615550110)

● IP address

CAC policy

specifies the information to be applied to the CAC group or groups associated

with it. Each CAC policy contains the following information:

● The CAC group to which the policy applies. The policy applies to all calls to and from the

CAC group.

● The traffic type controlled by the CAC policy— audio, fax, or both.

● The capacity limits the policy enforces for a primary link and optionally for a secondary

(backup) link. The primary and secondary capacities can be defined based on the number

of calls, bandwidth limit, or both, as follows:

– Number of calls: The concurrent calls per policy are counted. When the limit is

reached, no new calls are admitted.

– Bandwidth limit: The HiPath 8000 calculates the used bandwidth based on the

negotiated codecs in the session description protocol (SDP).

This value is the common limit for both upstream and downstream traffic. For example,

if a value of 1 Mbps is entered it indicates that the upstream bandwidth is 1Mbps and

the downstream bandwidth is 1Mbps as well.

– Both: If both are defined, the limit is enforced as soon as one is reached.

● Whether calls to the media server to play announcements/tones or to collect digits are

allowed even if insufficient bandwidth is present.

● Whether answered calls are allowed even if insufficient bandwidth is present. This can

occur in scenarios in which the resource reservation only takes place when the destination

answers (when the SDP offer is included in the SIP 200 OK response).

The primary and the secondary link capacities must use the same criteria. For

example, if the primary capacity is based on bandwidth limit, the secondary

capacity must also be based on bandwidth limit.

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Siemens HiPath 8000 Spécifications Page 138